Resonance-state-induced superconductivity at high Indium contents in In-doped SnTe

Abstract

We report a reinvestigation of superconducting Sn${}_{1-x}$In${}_x$Te at both low and high In doping levels. Analysis of the superconductivity reveals a fundamental change as a function of \textit{x}: the system evolves from a weakly coupled to a strongly coupled superconductor with increasing indium content. Hall Effect measurements further show that the carrier density does not vary linearly with Indium content; indeed at high Indium content, the samples are overall \textit{n}-type, which is contrary to expectations of the standard picture of In${}^{1+}$ replacing Sn${}^{2+}$ in this material. Density functional theory calculations probing the electronic state of In in SnTe show that it does not act as a trivial hole dopant, but instead forms a distinct, partly filled In 5\textit{s} - Te 5\textit{p} hybridized state centered around E${}_F$, very different from what is seen for other nominal hole dopants such as Na, Ag, and vacant Sn sites. We conclude that superconducting In-doped SnTe therefore cannot be considered as a simple hole doped semiconductor.

12 pages and 7 figures

References in corpus (6)

• Enhanced superconducting pairing interaction in indium-doped tin telluride
• Superconducting properties of the In substituted Topological Crystalline Insulator, SnTe
• Comparison of Sn-doped and nonstoichiometric vertical-Bridgman-grown crystals of the topological insulator Bi2Te2Se
• Superconducting Properties of BaBi${}_3$
• Studies of the superconducting properties of Sn1-xInxTe (x=0.38 to 0.45) using muon-spin spectroscopy
• Surface-state-dominated transport in crystals of the topological crystalline insulator In-doped Pb${}_{1-x}$Sn${}_x$Te

Cited by in corpus (26)

• A pressure-induced topological phase with large Berry curvature in Pb${}_{1-x}$Sn${}_x$Te
• Superconducting properties of high-entropy-alloy tellurides M-Te (M: Ag, In, Cd, Sn, Sb, Pb, Bi) with a NaCl-type structure
• Indium substitution effect on the topological crystalline insulator family (Pb${}_{1-x}$Sn${}_x$)${}_{1-y}$In${}_y$Te: Topological and superconducting properties
• Magnetoterahertz Response and Faraday Rotation from Massive Dirac Fermions in the Topological Crystalline Insulator Pb${}_{0.5}$Sn${}_{0.5}$Te
• Electronic properties of SnTe-class topological crystalline insulator materials
• Observation of coexisting weak localization and superconducting fluctuations in strained Sn1-xInxTe thin films
• High-Pressure Synthesis and Superconductivity of Ag-doped Topological Crystalline Insulator SnTe (Sn1-xAgxTe with x = 0-0.5)
• Evolution of electronic states and emergence of superconductivity in the polar semiconductor GeTe by doping valence-skipping In
• Tailoring band-structure and band-filling in a simple cubic (IV, III) - VI superconductor
• Superconductivity, pairing symmetry, and disorder in the doped topological insulator Sn${}_{1-x}$In${}_x$Te for x $\ge$ 0.10
• Electron and hole contributions to normal-state transport in the superconducting system Sn${}_{1-x}$In${}_x$Te
• Spin-singlet superconductivity in doped topological crystalline insulator Sn_{0.96}In_{0.04}Te
• Unusual phonon density of states and response to the superconducting transition in the In-doped topological crystalline insulator Pb${}_{0.5}$Sn${}_{0.5}$Te
• Superconductivity by alloying the topological insulator SnBi2Te4
• Tuning of Carrier Concentration and Superconductivity in High-Entropy-Alloy-Type Metal Telluride (AgSnPbBi)(1-x)/4InxTe
• Versatile electronic states in epitaxial thin films of (Sn-Pb-In)Te: from topological crystalline insulator and polar semimetal to superconductor
• Molecular beam epitaxy of superconducting Sn${}_{1-x}$In${}_x$Te thin films
• Nodeless superconducting gap in the candidate topological superconductor Sn${}_{1-x}$In${}_x$Te for x = 0.7
• Superconducting ground state study of valence skip compound AgSnSe${}_2$
• Quasi-localized Impurity State in Doped Topological Crystalline Insulator Sn${}_{0.9}$In${}_{0.1}$Te Probed by ${}^{125}$Te-NMR
• Bi Substitution Effects on Superconductivity of Valence-Skip superconductor AgSnSe2
• Specific Heat and Electrical Transport Properties of Sn0.8Ag0.2Te Superconductor
• Superconductivity in tin telluride films grown by molecular beam epitaxy
• High-pressure synthesis and superconducting properties of NaCl-type In1-xPbxTe (x = 0-0.8)
• Superconductivity in In-doped AgPbBiTe3 compounds synthesized by high-pressure synthesis
• Non-Trivial Topological Phase in the Sn_{1-x}In_xTe Superconductor